Shares of Arista Networks dropped after Cisco Systems got the partial backing of staff lawyers at the U.S. International Trade Commission in a patent-infringement case over routers.

On Monday, ITC staff lawyers recommended that Arista be found to have infringed two of six Cisco patents in the case. Cisco may have gained a significant advantage over Arista in Cisco’s second case at the ITC, Bloomberg Intelligence reported in a note.

The staff lawyers’ recommendation could have some influence with ITC Judge MaryJoan McNamara, who is hearing the second of two cases Cisco brought against its smaller rival. The trial is scheduled to last through Nov. 20, with the judge issuing her findings in April.

Arista closed down 2.2 percent to $68.90 in New York trading, after falling as low as $65.54 earlier in the day. Cisco was down less than 1 percent to $28.18.

The first ITC case, involving the same products but different patents, had a trial in September before a different judge who is scheduled to release his findings in May. The staff in that case recommended a finding in Cisco’s favor on three of five patents.

Cisco is seeking to block Ethernet switches used in data centers made by Arista, which was started by former Cisco employees. The judge’s findings will be reviewed by the six- member commission, which has the power to order products halted at the U.S. border if they infringe U.S. patents.

Cisco claims Arista built its business on copied and stolen technology, with some technical information including the original typos.

While Cisco remains a much larger company, Arista has been winning market share in one of Cisco’s most important businesses: the sale of machines called Ethernet switches which are used in data centers by Internet companies, banks and other large companies. Microsoft, Facebook and eBay are among Arista’s clients.

Arista’s switches are based on software that is designed to be easier to use and more cost effective than Cisco’s IOS software, which has been almost as widely used by network administrators as Microsoft Windows is for running computers.

Cisco also has filed patent- and copyright-infringement lawsuits against Arista in federal court, while Arista has asked the U.S. Patent and Trademark Office to invalidate Cisco’s patents.

President Recep Tayyip Erdogan said Tuesday that Turkey would boycott U.S.-made electronic products, escalating a feud with the Trump administration that has contributed to the rapid decline of the Turkish currency.

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